Posted by Krzysztof Lis on January 30, 2014
LNG, or liquified natural gas, is natural gas in a liquid state. It has been cooled to cryogenic temperatures, and because of that in atmospheric pressur it is in liquid state.
LNG can be used as car fuel, as well as CNG (compressed natural gas) can. Both these fuels have significant advantages over gasoline and diesel fuel.
Because of the liquid state, LNG is more than twice as dense as CNG. It needs to be stored in insulated tanks because of the low temperature, but under pretty low pressures, as compared to compressed natural gas. The latter requires over 200 times atmospheric pressure (3,000-3,600 psi, or 21 to 25 MPa), while LNG requires only 70-150 psi (0,5-1,0 MPa, 5-10 times the atmospheric pressure). LNG is supplied to the engine in liquid state and then vaporised, similarly to LPG (liquefied petroleum gas, propane-butane mix, also known as autogas). WAIT! There is more to read… read on »